DS Morrison

I’ve been using this app since it came out many years ago. It replaced my old trusty HP 12C, which I’ve had since the 1980’s (and which has sat unused in my desk drawer for decades). Why should I carry it around when I have the identical operations and keyboard layout on my phone and pad? With this newest version, the app fixed the remaining gripe that I had: the ability to copy a result and paste it into a different app. Now I consider it perfect!